docs(flaky-tests): clarify default stable branch recognition (main, master, develop)

[samgutentag]

Summary

Trunk now automatically recognizes main, master, and develop as stable branches for upload classification (trunk-io/trunk2#3555). This PR updates the Getting Started page to reflect that default:

• Update prerequisites bullet to list all three default branch names
• Add an info hint explaining the automatic recognition

Source

• trunk2 PR: https://github.com/trunk-io/trunk2/pull/3555

Test plan

• Preview in GitBook

[trunk-staging-io]

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[claude]

Claude finished @samgutentag's task in 57s —— View job

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PR Review

• Read changed files
• Check for typos, grammar, and formatting issues
• Review documentation best practices
• Post inline comments for specific issues
• Provide final summary

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The changes look good overall. The PR correctly updates the prerequisites to list all three default stable branch names and adds a helpful info hint.

One minor suggestion (non-blocking): The hint at line 39 says "Trunk will classify it correctly based on how your monitors are scoped" — but monitors aren't introduced until Step 4. A reader in Step 2 may not know what "monitors are scoped" means yet. I've left an inline suggestion to simplify that sentence.

Everything else is accurate, clear, and well-formatted. No blocking issues.

[claude]

Minor clarity issue: "Trunk will classify it correctly based on how your monitors are scoped" references monitor scoping, but monitors aren't introduced until Step 4 — a reader encountering this in Step 2 may not know what "monitors are scoped" means yet.

Consider simplifying the second sentence to remove the forward-reference:

Suggested change

	Trunk automatically recognizes `main`, `master`, and `develop` as stable branches. If your primary branch uses a different name, configure uploads from that branch the same way and Trunk will classify it correctly based on how your monitors are scoped.
	Trunk automatically recognizes `main`, `master`, and `develop` as stable branches. If your primary branch uses a different name, configure uploads from that branch the same way and Trunk will classify it correctly.

[github-actions]

Auto-approved: Claude code review passed.